EE sometimes changes to T-Mobile

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http://androidforums.com – I know Orange bought T-Mobile and sometimes you would move to a different network depending on how better the signal was, but when EE sent me a text saying switch your phone off then back on and then it showed as EE as my network, i didn't think it would still sometimes change to T-Mobile, i thought it would be EE all the time? can anyone tell me if this is normal for mine to still be sometimes changing to T-Mobile thenback to EE? james (General)